3681162521 has 2 divisors, whose sum is σ = 3681162522. Its totient is φ = 3681162520.

The previous prime is 3681162517. The next prime is 3681162539. The reversal of 3681162521 is 1252611863.

3681162521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1983722521 + 1697440000 = 44539^2 + 41200^2 .

It is a cyclic number.

It is not a de Polignac number, because 3681162521 - 2² = 3681162517 is a prime.

It is not a weakly prime, because it can be changed into another prime (3681102521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1840581260 + 1840581261.

It is an arithmetic number, because the mean of its divisors is an integer number (1840581261).

Almost surely, 2^3681162521 is an apocalyptic number.

It is an amenable number.

3681162521 is a deficient number, since it is larger than the sum of its proper divisors (1).

3681162521 is an equidigital number, since it uses as much as digits as its factorization.

3681162521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 35.

The square root of 3681162521 is about 60672.5845913951. The cubic root of 3681162521 is about 1544.0510814767.

The spelling of 3681162521 in words is "three billion, six hundred eighty-one million, one hundred sixty-two thousand, five hundred twenty-one".